Element ID Highlighter is a free Chrome browser extension designed for developers and QA engineers to enhance their workflow by visually marking HTML elements with specific attributes, such as data-testid. This tool automatically highlights these elements with a clear dashed outline, making it easier to identify testable UI components. It is particularly beneficial for teams that rely on data-testid for UI testing, ensuring that essential elements are easily accessible during the development process.

The extension supports single-page applications and frameworks like React, Vue, and Angular, automatically updating as the DOM changes. With zero configuration required, it is lightweight and has no impact on performance. Additionally, it prioritizes user privacy by not collecting or transmitting any data, modifying only the appearance of elements locally within the browser.